90 degrees
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A regular trapezoid (!) is a square. And each interior angle of a square is 90 degrees.
Each interior angle of a square is 90 degrees and its 4 angles add up to 360 degrees
Each exterior angle of a square measures 90 degrees
Each exterior angle of a square is 90 degrees and a square is a regular 4 sided quadrilateral
each measure of the angle at point h has a measure of